Absorbing material and absorptive article using the same

a technology of absorbent and absorbent article, which is applied in the direction of bandages, chemistry apparatus and processes, and other chemical processes, can solve the problems of difficult to absorb, difficult to absorb, and difficult to absorb, and achieve excellent diffusibility and high permeation rate.

Inactive Publication Date: 2007-04-26
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] An object of the present invention is to provide an absorbent having a small amount of re-wet of an aqueous liquid and a high permeation rate and being excellent in diffusibility, without increasing the amount of the water-absorbent resin in the absorbent, and an absorbent article in which the absorbent is used.

Problems solved by technology

However, the above-mentioned absorbent and the absorbent article in which the absorbent is used are not fully satisfactory from the viewpoint of liquid leakage during absorption and re-wet after the absorption.
In addition, there are some problems such that the amount of a water-absorbent resin is increased in the absorbent, so that the absorbent is expensive and has an increased heavy feel, and a harder texture.

Method used

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  • Absorbing material and absorptive article using the same
  • Absorbing material and absorptive article using the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0071] The amount 340 g of n-heptane and 0.92 g of a sucrose fatty acid ester (manufactured by MITSUBISHI CHEMICAL CORPORATION under the trade name of S-370) were added to a 1000 mL-five-necked cylindrical round bottomed flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen gas inlet tube. The mixture was dispersed in the flask, and the temperature of the dispersion was raised to dissolve the sucrose fatty acid ester, and thereafter the resulting solution was cooled to 55° C.

[0072] Separately from the above, 92 g (1.02 mole) of an 80% by weight aqueous solution of acrylic acid was added to a 500 mL-Erlenmeyer flask. Thereto was added dropwise 102.2 g (0.76 mole) of a 30% by weight aqueous sodium hydroxide with cooling from external, to neutralize 75% by mole of acrylic acid. Further, 50.2 g of water, 0.11 g (0.41 mole) of a radical polymerization initiator potassium persulfate, and 9.2 mg of an internal crosslinking agent ethylene glycol...

preparation example 2

[0076] The same procedures as in Preparation Example 1 were carried out except that 2,2′-azobis(2-amidinopropane)dihydrochloride (manufactured by Wako Pure Chemical Industries, Ltd. under the product number of V-50) was used in place of the radical polymerization initiator potassium persulfate used in the aqueous monomer solutions for the first-step and second-step polymerizations, and that their amounts used were changed to 0.09 g (0.33 mmole) in the first step and 0.12 g (0.44 mmole) in the second step in Preparation Example 1, to give 212.4 g of a water-absorbent resin (B).

preparation example 3

[0077] The same procedures as in Preparation Example 1 were carried out except that the internal crosslinking agent ethylene glycol diglycidyl ether was not used in the aqueous monomer solution for a first-step polymerization, and that the amount of the internal crosslinking agent ethylene glycol diglycidyl ether used in the aqueous monomer solution for a second-step polymerization was changed from 35.7 mg to 11.9 mg in Preparation Example 1, to give 214.5 g of a water-absorbent resin (C).

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Abstract

An absorbent comprising a water-absorbent resin and a hydrophilic fiber, characterized in that the above-mentioned water-absorbent resin has a water absorption (a) of physiological saline of 60 to 100 g/g and a water-retaining capacity (b) of physiological saline of 45 to 80 g/g, and that the water absorption (a) of physiological saline and the water-retaining capacity (b) of physiological saline satisfy the relationship of the formula: [Water absorption (a) of physiological saline]≧[Water-retaining capacity (b) of physiological saline]+15, and an absorbent article, wherein the above-mentioned absorbent is interposed between a liquid-permeable sheet and a liquid-impermeable sheet.

Description

TECHNICAL FIELD [0001] The present invention relates to an absorbent and an absorbent article in which the absorbent is used. More specifically, the present invention relates to an absorbent which can be suitably used in hygienic materials such as disposable diapers, incontinence pads and sanitary napkins, and an absorbent article in which the absorbent is used. BACKGROUND ART [0002] Absorbent articles such as disposable diapers, sanitary napkins, incontinence pads and breast milk pads have a structure in which an absorbent is interposed between a liquid-permeable sheet to be placed on a side contacting a body and a liquid-impermeable sheet to be placed on a side opposite thereto. In addition, an absorbent has an action of absorbing and retaining an aqueous liquid such as urine or blood excreted from a body, and comprises a water-absorbent resin which absorbs and retains an aqueous liquid, and a hydrophilic fiber. [0003] In recent years, progress has been made in thinning absorbent ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F13/15B01J20/26B01J20/28
CPCA61F13/15203A61F13/531A61F2013/15016B01J20/26B01J20/28026B01J20/28028B01J2220/68
Inventor YOSHINO, KAZUHIROKAWAKITA, TOMOKINAWATA, YASUHIRO
Owner SUMITOMO SEIKA CHEM CO LTD
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